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A post-mortem examination gave cause of death as multiple stab wounds.

Officers say the sixth form student was with a friend on their way to his friend’s relative’s house in Brixton when they were chased by two young men and assaulted.

Detective Chief Inspector John McFarlane from the Met’s homicide and serious crime command said: "I am keen to speak to the driver of the minicab, they may have some vital information that could
help with this investigation.

"If you are a minicab driver that was on duty during the afternoon and evening of Friday 2 March in the Camberwell area and you took a fare to Moorlands Estate we would urge you to come forward and
speak to police.

"Kwame was an innocent young man enjoying himself on a Friday afternoon when he was pursued and attacked by two knifemen.”

He added: "I would also appeal for anybody who was in or around the Moorlands Estate at that time and may have any information to come forward.

"At this stage I believe that this was a random selection of victim and that Kwame could have been attacked by individuals who saw people they did not know on what they perceived to be their
territory.

"I also have to consider the possibility that the attack on Kwame was carried out in revenge for the stabbing of another youth in West Norwood on or another stabbing last week."

The two suspects are described as black, aged in their late teens or early twenties. They were both wearing dark clothing.

Anyone with information should call the incident room on 020 8721 4205 or Crimestoppers anonymously on 0800 555 111.